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Wrong PSU reading, No beeps, No boot

Hello Dashing star, Got sidetracked yesterday so couldn't get back to you, sorry My question is that even the output of PSU in multimeter shows correct readings it is possible the...
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Dashing star

Posted 06 October 2015 - 06:39 AM

Dashing star

Member

Member

722 posts

Hello,

In my pc i did not hear beeps without RAM, approximately with a try of 10 times it beeps for one time which is 4 beeps. Also some time it beeps like crazy, which was different and not like normal beeps.

No external graphic card, it is onboard one.

Steps I did:

Clear the cmos, also try with 8 different cmos batteries

Only one RAM slot but RAM is good which is SD-RAM

Keyboard not work at the time.

I remove all external devices and connect only psu and cmos battery still no beeps or boot.

Also when i check the PSU with voltmeter it shows 24 v, 6.5v and 10v for the readings of 12v, 3.3v and 5v which is double the amount of normal set of readings.

what you guys think about it whether it is PSU faulty or mobo faulty? when i switch on the psu the cpu fan running normally and LED is on, also there is no overheating of the processor, after running several minutes i touch the heatsink and mobo no overheating.

phillpower2

Posted 07 October 2015 - 07:46 AM

Also the motherboard i mention is not personal computer rather than embedded computer one whichbelongs to textile machine.

I already took the model there is no specified model name, but it is phoenix BIOS.

Sorry but not sure that I will be able to help with such a machine but as previously mentioned the first thing that I would do is remove the junk brand and quality imax PSU and swap in a known good one, see my canned explanation below.

As a PSU puts out various voltages +3.3V, +5V and +12V it may appear that the PSU is working correctly but it is not, any significant drop of any output can prevent the system from booting up, the other scenario is a significant increase in the output which can be worse as it can fry one or more major components such as the MB, CPU, Ram, add on video card etc.

Phoenix have a slightly more complex beep pattern than others, none of them are as simple as 4 beeps but we need to keep in mind that the BIOS may have been specifically made for the manafacturer of the textile machine and so is nothing like a normal computer MBs beep pattern BIOS beep codes

Regarding SD-RAM , it is brand new one. Is there any possibility of BIOS failure like that?

Hard to prove if the Ram is good or bad without any error beeps I'm afraid.

Worth mentioning here, as the graphics are integrated into the MB it will rely on the presence of the Ram to support it and in this instance one test that we normally suggest be done if there are no beeps and no video is to remove the Ram and then power up, if you then get error beeps it may suggest that the Ram is good and that the problem lays elsewhere and more often than not it is the graphics solution that has issues, if you still get no beeps with the Ram removed it suggests that the problem is with one of the following in this order: 1: The power supply. 2: The MB. 3: The CPU.

Dashing star

Posted 07 October 2015 - 11:19 PM

I would do is remove the junk brand and quality imax PSU and swap in a known good one

My question is that even the output of PSU in multimeter shows correct readings it is possible the PSU may be faulty? If yes then why it shows the readings correctly? I try to swap good one and check.

Edit 1: I check out with another new PSU... the motherboard beeps irregular and non-stop beeps which drives me crazy so i switch it off and ON again then there is no beeps at all....

Phoenix have a slightly more complex beep pattern than others, none of them are as simple as 4 beeps but we need to keep in mind that the BIOS may have been specifically made for the manafacturer of the textile machine and so is nothing like a normal computer MBs beep pattern BIOS beep codes

Hard to prove if the Ram is good or bad without any error beeps I'm afraid.

Worth mentioning here, as the graphics are integrated into the MB it will rely on the presence of the Ram to support it and in this instance one test that we normally suggest be done if there are no beeps and no video is to remove the Ram and then power up, if you then get error beeps it may suggest that the Ram is good and that the problem lays elsewhere and more often than not it is the graphics solution that has issues, if you still get no beeps with the Ram removed it suggests that the problem is with one of the following in this order: 1: The power supply. 2: The MB. 3: The CPU.

Yes. I agree with you. But the link you provided is not working. Today i spend my whole day with this and post you back...

Thanks for your valuable time!

Edit 2: I give a close look on the back side of the motherboard which i see is a capacitor which is burnt near the processor which is written as Q3 ( which means for capacitor i think)...

phillpower2

Posted 09 October 2015 - 07:39 AM

My question is that even the output of PSU in multimeter shows correct readings it is possible the PSU may be faulty? If yes then why it shows the readings correctly? I try to swap good one and check.

As per my earlier reply;

As a PSU puts out various voltages +3.3V, +5V and +12V it may appear that the PSU is working correctly but it is not, any significant drop of any output can prevent the system from booting up, the other scenario is a significant increase in the output which can be worse as it can fry one or more major components such as the MB, CPU, Ram, add on video card etc.

A multimeter does not test a PSU when it is under load and so cannot be relied upon, see my canned text below for the equipment required to truly test a PSU;

I do not wish to alarm you but the attached video is the one that I use as an example to show the sort of equipment that is required to conclusively test a PSU, I am not aware of any Staples outlet that has such equipment in store.

What the equipment does is simulate a computer under load and so the PSU behaves as it would when it is powering your PC, multi-meters and the basic testing devices that you can purchase from some merchants only test the basic voltage output from the PSU rails and so cannot be relied on as 100% conclusive.

Edit 1: I check out with another new PSU... the motherboard beeps irregular and non-stop beeps which drives me crazy so i switch it off and ON again then there is no beeps at all....

A change in the behaviour with an alternative PSU proves that the original PSU is in some way involved.

Regarding the BIOS;

The link works for me so not sure why it will not for you I have copy/paste them for you below in any event, some additional info here on capacitors;

phillpower2

Posted 10 October 2015 - 11:33 AM

Edit 2: I give a close look on the back side of the motherboard which i see is a capacitor which is burnt near the processor which is written as Q3 ( which means for capacitor i think)...

Would it be possible to take and upload a picture for us.

BTW: Geeks to Go is a (free) computer help forum and we will always do our best to help with any computer related issue/s, you are asking for assistance with something that is certainly not personal computer related and therefore outside of my remit you may want to consider posting on the GTG Off Topic forum or any company website that may be available for the textile machine concerned.

Dashing star

Posted 12 October 2015 - 01:06 AM

Dashing star

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Topic Starter

Member

722 posts

BTW, I consult a Trained Tech he told that the Transistor which responsible for voltage regulator to processor is burnt so it is difficult to change the transistor itself and have to buy the new motherboard .